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What causes the green solution when an iron nail is placed in copper sulphate solution?

Answer and explanation

Correct answer: Formation of iron sulphate

Iron is above copper in the reactivity series, so it can displace copper from copper sulphate solution. The reaction is Fe + CuSO₄ → FeSO₄ + Cu. Aqueous iron(II) sulphate is pale green, while copper metal deposits on the nail. Therefore formation of iron sulphate explains the green colour. The other proposed compounds contain elements not involved in this reaction, so A is correct.

Related tags

ScienceClass10Displacement-ReactionIron-SulphateChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq

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